In quizbowl, it is used to refer to an incorrect early buzz on a tossup. This term comes from the fact that usually one receives a -5 (negative five) point penalty for an incorrect answer when one buzzes in before a tossup has been completely read. However, this term is stilled used when playing on formats in which there is no early buzz penalty. If you hear the entire question, however, you simply "get it wrong" and thus did not commit the sin of negging.

At 2006 PACE NSC (which has no point penalties):
me: "Yeah get this, I negged on that tossup on the movie Munich early on in the question, and said Team America World Police instead."

teammate: "Wtf? How did that happen?"

me: "Well, they mentioned a ferris wheel blowing up in the beginning and something about a montage, and since Montage is an often-used Trey Parker/Matt Stone song, why not buzz?"